Who owns W. R. Berkley Corp, from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
WR Berkley & Others LLC: 25.7% · 95,557,324 shares — WR Berkley & Others 2 LLC: 25.7% · 95,557,324 shares — Estate of William R. Berkley: 25.7% · 95,557,324 shares
Mitsui Sumitomo Insurance Co., Ltd.: 15.8% · 58,780,450 shares — MS&AD Insurance Group Holdings, Inc.: 15.8% · 58,780,450 shares
3 more 5% stakes behind a free account
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Sign up freeEvery institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of W. R. Berkley Corp they hold. Together these 1139 managers report 86.85% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| Mitsui Sumitomo Insurance Co Ltd | $4.15B | 58,780,450 | 100.00% | 15.83% | June 30, 2026 |
| VANGUARD GROUP INC | $2.6B | 37,033,581 | 0.04% | 9.98% | December 31, 2025 |
1,137 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together the 500 largest funds we checked hold 25.47% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| VANGUARD TOTAL STOCK MARKET INDEX FUND | $625M | 0.03% | 2.39% | June 30, 2026 |
| VANGUARD 500 INDEX FUND | $537M | 0.03% | 2.05% | June 30, 2026 |
498 more funds behind a free account
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